i put my splenda in fit day a few days ago. it says less than 1 carb on the splenda package and no calories. the atkins book says to count one tsp of splenda as one carb. When i put that in fit day it says it has 4 calories per teaspoon so i now count that when I use splenda, just wanted to warn you. Hidden calories and carbs are such a pain, these companys are sneaky.